A while ago RemoveDuplicates stage [0] was introduced to solve the problem of enforcing uniqueness constraints within a repository version at sync time. The same problem ought to be solved when content which already exists in Pulp is added to a repository. E.g. Content was uploaded, or content was synced as a part of other repo. And now you want to add/copy it to your repo.
RPM plugin has to solve this problem (specific examples can be seen in this issue [1]). It would be great if other plugins can share if the same problem exists for them and if it's valuable to add some mechanism to the pulpcore. I believe, if you use RemoveDuplicates stage during sync, then your plugin is impacted by the described problem. My personal opinion: if RemoveDuplicates stage was worth adding to the pulpcore (stages API in pulpcore-plugin), a mechanism to ensure uniqueness constraints within a repo version at association time makes sense to add as well. [0] https://github.com/pulp/pulpcore-plugin/blob/master/pulpcore/plugin/stages/association_stages.py#L90 [1] https://pulp.plan.io/issues/4898
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